Data over normal GSM call

[Stefano Cavallari]

On Monday 14 April 2008 21:00:34 Harald Welte wrote:
> On Sun, Apr 13, 2008 at 07:57:02PM -0500, Hans L wrote:
[...]
> AFAIR, the DTMF key press is encoded and send over the Um (air)
> interface to the BTS/BSC/MSC and then in the end converted into
> actual audible sounds.
>
> Please see Page 22 of http://www.chu.edu.tw/~lhyen/wc/gsm.pdf for a
> graphical illustration how this works.

This imply that there is a data channel available. Can you trasmit anything 
else that DTMF? What is the bandwidth of this channel?

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